/* Level and hub pages: level switcher, stats, topics, assignments, quizzes, datasets and tables. Shared base: base.css. */
/* level switcher + stats (same pattern as Flashcards) */
.ctl-lbl{font-family:var(--mono);font-size:.72rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.06em;margin-bottom:6px}
.seg{display:flex;background:var(--surface-3);border:1px solid var(--border);border-radius:8px;padding:3px;gap:3px;overflow-x:auto;scrollbar-width:none;margin:14px 0 16px}
.seg::-webkit-scrollbar{display:none}
.seg a{flex:1 0 auto;text-decoration:none;text-align:center;padding:8px 12px;border-radius:6px;font-size:.9rem;color:var(--text-secondary);min-height:40px;display:flex;align-items:center;justify-content:center;gap:6px;white-space:nowrap}
.seg a .dot{width:8px;height:8px;border-radius:50%;flex:none}
.seg a[aria-current="page"]{background:var(--surface-1);color:var(--text-primary);font-weight:600;box-shadow:inset 0 -2px 0 var(--gold-line),0 0 0 1px var(--border)}
.seg a:not([aria-current]):hover{background:var(--surface-3)}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-bottom:14px}
.stat{background:var(--surface-1);border:1px solid var(--border);border-radius:8px;padding:8px 10px}
.stat>b{display:block;font-size:1.25rem;line-height:1.2;font-variant-numeric:tabular-nums}
.stat span{font-size:.75rem;color:var(--text-muted);font-family:var(--mono)}
.stat.ok>b{color:var(--text-primary)}
.jump{display:flex;gap:6px;overflow-x:auto;padding-bottom:4px;margin-bottom:18px;scrollbar-width:none}
.jump::-webkit-scrollbar{display:none}
.jump a{flex:none;border:1px solid var(--border-strong);background:var(--surface-1);border-radius:999px;padding:6px 12px;font-size:.84rem;min-height:36px;display:inline-flex;align-items:center;gap:6px;white-space:nowrap;text-decoration:none;color:var(--text-secondary)}
.jump a:hover{border-color:var(--text-muted);color:var(--text-primary)}
.jump a .p{font-family:var(--mono);font-size:.7rem;color:var(--text-muted)}

/* topics (same as the course page) */
.topic{background:var(--surface-1);border:1px solid var(--border);border-radius:8px;margin:0 0 26px;overflow:hidden}
.topic>header{padding:16px 20px;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.topic>header h2{margin:0;font-size:1.2rem;letter-spacing:0}
.topic>header .hright{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.topic>header .ds{font-size:.82rem;color:var(--text-secondary)}
.topic>header .ds code{cursor:pointer}
.tabs{display:flex;border-bottom:1px solid var(--border);background:var(--surface-3);overflow-x:auto;scrollbar-width:none}
.tabs::-webkit-scrollbar{display:none}
.tabs button{flex:0 0 auto;padding:10px 16px;border:0;background:none;color:var(--text-secondary);border-bottom:2px solid transparent;font-size:.9rem}
@media (max-width:560px){.tabs{flex-wrap:wrap;overflow-x:visible}}
.tabs button[aria-selected="true"]{color:var(--text-primary);border-bottom-color:var(--gold-line);font-weight:600;background:var(--surface-1)}
.tabs button .n{font-family:var(--mono);font-size:.75rem;color:var(--text-muted);margin-left:6px}
.pane{padding:6px 20px 18px}
.pane[hidden]{display:none}
.asg{padding:16px 0;border-bottom:1px dashed var(--border)}
.asg:last-child{border-bottom:0}
.asg .top{display:flex;gap:12px;align-items:flex-start;position:static;background:none;border:0;padding:0}
.asg input[type=checkbox]{width:20px;height:20px;margin-top:3px;accent-color:var(--gold-line);flex:none}
.asg h3{margin:0 0 4px;font-size:1rem}
.asg .meta{font-size:.8rem;color:var(--text-secondary);font-family:var(--mono);margin-bottom:8px}
.asg ol{margin:6px 0 8px;padding-left:20px}
.asg ol li{margin-bottom:4px}
.expect{background:var(--grail-gold-soft);border-left:3px solid var(--gold-line);padding:8px 12px;border-radius:0 4px 4px 0;font-size:.9rem;margin-top:8px}
.expect b{color:var(--grail-gold-ink)}
details{margin-top:8px}
summary{cursor:pointer;font-size:.88rem;color:var(--text-secondary);user-select:none}
summary:hover{color:var(--text-primary)}
details[open] summary{margin-bottom:6px}
.qa{border-bottom:1px dashed var(--border);padding:10px 0}
.qa:last-child{border-bottom:0}
.qa summary{font-size:.98rem;color:var(--text-primary);font-weight:500;list-style:none;display:flex;gap:10px}
.qa summary::-webkit-details-marker{display:none}
.qa summary::before{content:"+";font-family:var(--mono);color:var(--text-muted);width:14px;flex:none}
.qa[open] summary::before{content:"–"}
.qa .a{color:var(--text-secondary);font-size:.93rem;padding-left:24px}
.quiz{padding:14px 0;border-bottom:1px dashed var(--border)}
.quiz:last-child{border-bottom:0}
.quiz .q{font-weight:500;margin-bottom:8px}
.quiz .opts{display:grid;gap:6px}
.quiz .opts label{display:flex;gap:10px;align-items:flex-start;padding:7px 10px;border:1px solid var(--border);border-radius:4px;cursor:pointer;font-size:.93rem}
.quiz .opts label:hover{border-color:var(--text-muted)}
.quiz .opts label.ok{background:var(--success-soft);border-color:var(--success)}
.quiz .opts label.bad{background:var(--danger-soft);border-color:var(--danger)}
.quiz .why{margin-top:8px;font-size:.88rem;color:var(--text-secondary);display:none}
.quiz.answered .why{display:block}
.quiz .task{background:var(--surface-3);border:1px solid var(--border);padding:10px 12px;border-radius:4px;font-size:.92rem}
.quiz .task .lbl{font-family:var(--mono);font-size:.75rem;color:var(--text-muted);margin-bottom:4px}
.score{margin-top:12px;font-size:.88rem;color:var(--text-secondary)}
.flash{animation:flash 1.6s ease-out}
@keyframes flash{0%,30%{box-shadow:0 0 0 3px var(--gold-line);border-radius:6px}100%{box-shadow:0 0 0 3px transparent}}

/* resources */
.sect{margin:8px 0 34px}
.sect>h2{margin-bottom:6px}
.tools{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:10px;margin-top:12px}
.tools>a{display:flex;flex-direction:column;gap:4px;background:var(--surface-1);border:1px solid var(--border);border-radius:8px;padding:14px 16px;text-decoration:none}
.tools>a:hover{border-color:var(--text-muted)}
.tools>a b{font-size:1rem}
.tools a span{font-size:.85rem;color:var(--text-secondary)}
.dsgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:10px;margin:14px 0 22px}
.dsgrid a{display:block;text-decoration:none;background:var(--surface-1);border:1px solid var(--border);padding:10px 12px;border-radius:var(--r-2);font-size:.9rem}
.dsgrid a:hover{border-color:var(--text-muted)}
.dsgrid a span{display:block;color:var(--text-muted);font-family:var(--mono);font-size:.75rem}
.dataset{background:var(--surface-1);border:1px solid var(--border);border-radius:8px;margin-bottom:22px;overflow:hidden}
.dataset>header{padding:14px 18px;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.dataset>header h3{margin:0;font-size:1.05rem}
.dataset>header .desc{font-size:.85rem;color:var(--text-secondary);flex:1 1 100%}
.dataset .acts{display:flex;gap:8px;flex-wrap:wrap}
.tblwrap{overflow-x:auto;max-height:420px;overflow-y:auto;-webkit-overflow-scrolling:touch}
table{border-collapse:collapse;width:100%;font-size:.8rem;font-family:var(--mono)}
th,td{padding:5px 10px;border-bottom:1px solid var(--border);white-space:nowrap;text-align:left}
th{position:sticky;top:0;background:var(--surface-3);font-weight:500;color:var(--text-secondary)}
tbody tr:nth-child(even){background:color-mix(in srgb,var(--surface-3) 50%,transparent)}

/* prev / next */
.pager{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;margin:10px 0 0}
.pager a{flex:1 1 220px;display:flex;flex-direction:column;gap:2px;text-decoration:none;background:var(--surface-1);border:1px solid var(--border);border-radius:8px;padding:12px 16px}
.pager a:hover{border-color:var(--text-muted)}
.pager a span{font-size:.75rem;color:var(--text-muted);font-family:var(--mono)}
.pager a.next{text-align:right}

@media (pointer:coarse){
  .tabs button{padding:12px 16px;min-height:44px}
  .quiz .opts label{padding:11px 12px;min-height:44px}
  .asg input[type=checkbox]{width:24px;height:24px;margin-top:1px}
  .qa summary{padding:6px 0;min-height:40px}
  .topic>header .ds code{display:inline-block;padding:4px 8px;margin:2px 0}
}
@media (max-width:640px){
  .stats{grid-template-columns:repeat(2,1fr)}
  .seg{flex-wrap:wrap}
  .seg a{flex:1 1 40%}
  .topic{border-radius:6px;margin-bottom:20px}
  .topic>header{padding:14px 16px}
  .topic>header h2{font-size:1.1rem}
  .tabs button{padding:12px;font-size:.86rem}
  .pane{padding:4px 14px 14px}
  .asg .top{gap:10px}
  .asg ol{padding-left:18px}
  .qa .a{padding-left:0}
  pre{font-size:.78rem;padding:12px}
  .dsgrid{grid-template-columns:1fr 1fr}
  .tblwrap{max-height:60vh}
}
@media print{.top,.seg,.jump,.foot .row,.srch,.gpop,.toast{display:none!important}body{background:#fff}.topic{break-inside:avoid-page}}